CN103347014A - Network fast forwarding module and network fast forwarding achieving method - Google Patents
Network fast forwarding module and network fast forwarding achieving method Download PDFInfo
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Abstract
The invention provides a network fast forwarding module and a network fast forwarding achieving method. The achieving method includes the steps of initializing the network fast forwarding module, registering in each linux network subsystem, enabling the network fast forwarding module to obtain and cache network forwarding rules which are issued by a linux network protocol stack, generating a fast forwarding rule cache table when various types of network data flow is initiatively forwarded by the linux network protocol stack, matching the network data flow with the fast forwarding rule cache table after the network data flow is received from network cards again, and directly sending out the network data flow from the corresponding network card if corresponding fast forwarding rules exist, otherwise, sending the network data flow back to the linux network protocol stack to be processed. According to the network fast forwarding module and the network fast forwarding achieving method, bridging and routing forwarding are supported, the network forwarding procedure is simplified, CPU resource consumption is reduced, forwarding delayed time is shortened, and the network forwarding handling capacity is greatly improved.
Description
Technical field
The present invention relates to the network communication terminal field, relate in particular to and a kind ofly be applied to the quick forwarding module of network of ustomer premises access equipment (be called for short CPE) and transmit implementation method fast based on the network of Linux.
Background technology
Along with the continuous maturation of Internet technology, internet, applications more and more widely, the user has produced higher requirement to the network bandwidth and performance of network equipments.The construction of fixed network operator " light advances copper and moves back " network design, the network insertion bandwidth rises to 100Mbps even 1Gbps from several Mbps, can satisfy fully from link bandwidth that user's high speed data transfer, HD video are play and the application demands such as VOIP of low delay, and user terminal network equipment has become the bottleneck of forwarded throughput.
(SuSE) Linux OS is as free and increase income a free operant system, network support ability and stability that it is powerful, be subjected to the welcome of communications equipment manufacturer deeply, most user terminal network access devices are based on the linux system and develop now, are with good expansibility.
At present, ustomer premises access equipment normally carries out the forwarding of network packet by the linux network protocol stack, forwarded flow process complexity, the cpu resource consumption is many, and having bigger forwarding time delay, forwarding throughput is little, thereby is necessary this retransmission method is improved.
Summary of the invention
The object of the present invention is to provide the quick forwarding module of a kind of network and transmit implementation method fast based on the network of Linux, simplify the forwarded flow process, reduce the cpu resource consumption, reduce and transmit time delay, increase and transmit bag quantity in the unit interval, finally reach the purpose that improves forwarding throughput.
The objective of the invention is to be achieved through the following technical solutions.
The quick forwarding module of a kind of network, this module runs on kernel state, comprises with lower unit:
Registering unit: when initialization, register to each network subsystem of linux;
The rule buffer unit: be used for receiving the data forwarding information needed that the linux network protocol stack issues according to institute's logon mode when transmitting various types of network data flow first, the row cache of going forward side by side generates and transmits regular cache table fast;
Matching treatment unit: be used for before data flow in same type receives the back from network interface card again, enters the linux network protocol stack, coupling is transmitted regular cache table fast, if wherein there is the quick forwarding rule of the type data flow correspondence, then accordingly this data flow is directly sent from corresponding network interface card, otherwise this data flow is back to the linux network protocol stack, is transmitted by the linux network protocol stack and handle.
Wherein, also comprise:
State refresh unit: in order to refresh each quick state of transmitting rule of regular buffer unit buffer memory; When having data flow to pass through the matching treatment unit directly to transmit, the quick forwarding rule that refreshes its correspondence is active state, is inactive state otherwise refresh it; Regularly remove the quick forwarding rule that is in inactive state.
A kind of network is transmitted implementation method fast, uses the above-mentioned quick forwarding module of network, and the method comprising the steps of:
The quick forwarding module of described network carries out initialization, registers to each network subsystem of linux;
When various types of network data flows were transmitted by the linux network protocol stack for the first time, the forwarded rule that the quick forwarding module of network obtains and buffer memory linux network protocol stack issues by described logon mode generated and transmits regular cache table fast;
Before having network data flow to receive the back from network interface card again, entering the linux network protocol stack, the quick forwarding module of network mates this network data flow and the list item of transmitting regular cache table fast, if there is corresponding quick forwarding rule, then accordingly this network data flow is directly sent from corresponding network interface card, otherwise this network data flow is back to the linux network protocol stack, is transmitted by it and handle.
Wherein, also comprise:
If the quick forwarding module of network directly sends the current network data flow according to transmitting rule fast, then refresh quick forwarding rule corresponding in the quick forwarding rule cache table for active state, be inactive state otherwise refresh;
Have network data flow pass through the NFP module directly transmit the back, in the linux network protocol stack corresponding forwarded rule overtime aging before, the state of quick forwarding rule corresponding in the regular cache table is transmitted in inquiry fast, if active state then refreshes relevant timer time in the linux protocol stack, wait overtime this operation of repetition next time;
For the quick forwarding rule that is in inactive state in the quick forwarding rule cache table, treat that the relevant timer of linux protocol stack removes when overtime next time.
Wherein, the quick forwarding module of described network obtain and buffer memory forwarded process of rule be:
Network interface event notice in the registration linux system when network interface establishment, deletion and state variation, is updated to quick forwarding rule cache table by notification callback function with network interface information;
By registration linux protocol stack bridge joint subsystem jackshaft port events notice, obtain the information of bridge port in the system, the bridge joint that is used for the quick forwarding module of network is transmitted fast;
Registration hook function is used for the quick forwarding module bridge joint of learning network and transmits required forwarding information fast in linux protocol stack bridge joint subsystem;
Registration linux protocol stack neighbours subsystem rule notice chain by the corresponding relation of notification event call back function study IP address and MAC Address, is used for the quick forwarding module of network and carries out the IP address resolution;
Route-caching change events notice in the registration linux protocol stack routing subsystem, by the notification event call back function with Fib information (Forwarding Information Base, transmit essential information, be routing forwarding information, comprise purpose IP address, next bar IP address and outgoing interface) be updated to the quick forwarding module of network, and with Arp rule (Address Resolution Protocol, be the corresponding relation of IP address and link layer MAC Address) set up incidence relation, be used for obtaining next-hop ip address when the quick forwarding module of network is transmitted fast and sending network interface;
Registration linux protocol stack connects Track Table change events notice, and 5 tuples that will connect by the notification event call back function are updated to the quick forwarding module of network, and with Fib and Arp rule association, IP address and Port change when being used for the NFP module and transmitting fast.
Compared with prior art, the embodiment of the invention has following beneficial effect:
Different with conventional linux system network protocol stack repeating process, (the Network Fast Processing of NFP module among the present invention, be the quick forwarding module of network) transmit information needed by registration hook function and the automatic learning network of notifications event, and form the quick rule of transmitting; When next network packet arrived, the NFP module was transmitted regular buffer memory fast by retrieval and is directly transmitted.Like this, the NFP module forwards just can be walked around the linux network protocol stack, thereby simplifies the forwarded flow process, reduce the cpu resource consumption, reduce and transmit time delay, increase and transmit bag quantity in the unit interval, support bridge joint and routing forwarding, improved the forwarded throughput significantly.
Description of drawings
Fig. 1 is the theory structure schematic diagram of the NFP module that provides of the embodiment of the invention.
Fig. 2 is the NFP module forwards that provides of the embodiment of the invention and the contrast schematic diagram of linux core network protocol stack pass-through mode.
Fig. 3 is that the NFP module that the embodiment of the invention provides learns to transmit fast the process of rule schematic diagram automatically.
Fig. 4 is the quick forwarding implementation method flow chart of the network data flow that provides of the embodiment of the invention.
Embodiment
The invention provides a kind of in the linux network protocol stack, study automatically and transmit rule, and in the NFP module, create quick forwarding cache.When next network package is received by network interface card, before advancing the processing of linux network protocol stack, at first from the quick forwarding cache of NFP module, find corresponding forwarding information, and revise heading according to cache information, directly call network interface card and drive transmission, handle otherwise return the linux network protocol stack.Below the inventive method is elaborated.
See also NFP module shown in Figure 1, this NFP module forwards and linux core network protocol stack are transmitted contrast (wherein, solid-line curve is the NFP forward-path, and imaginary curve is the Linux forward-path) as shown in Figure 2, greatly the forwarding process of reduced data stream.Particularly, the NFP module runs on kernel state, comprises with lower unit:
Registering unit: registration hook function and dependent event are notified linux each network subsystem when the NFP module initialization, safeguard by hook and event handling function and transmit regular cache table fast.
Rule buffer unit: receive forwarded rule that the linux network protocol stack the issues row cache of going forward side by side, generate and transmit regular cache table fast; The linux network protocol stack is when transmitting the network data flow of current type for the first time, and information that will be relevant with forwarding is issued to regular buffer unit by the hook function of registering unit registration and the mode of event notice.
Matching treatment unit: before receiving the back from network interface card again in a certain type network data flow, entering the linux network protocol stack, coupling is transmitted regular cache table fast, if there is the quick forwarding rule of the type data flow correspondence, then the quick forwarding rule according to correspondence directly sends this data flow from corresponding network interface card, transmits processing otherwise it is returned the linux network protocol stack by it.
State refresh unit: in order to refresh each quick state of transmitting rule of regular buffer unit buffer memory; When having network data flow to pass through the matching treatment unit directly to transmit, the quick forwarding rule that refreshes its correspondence is active state, otherwise refresh it for inactive state, and be as the criterion with the timer in the linux protocol stack and regularly remove the quick forwarding rule of inactive state.In implementation procedure, a certain type network data flow is by after the NFP module forwards, pass through the hook function that the NFP module is registered in the linux network protocol stack with before transmitting relevant regular overtime wearing out, inquire about current quick forwarding rule and transmit active state in the regular cache table fast in the NFP module, if active state then refreshes relevant timer time in the linux protocol stack, wait overtime this operation of repetition next time; If inactive state, treat to remove when the relevant timer of linux protocol stack is overtime next time this quick forwarding cache rule.
In the present embodiment, the method that the NFP module is learnt linux network protocol stack forwarded rule automatically as shown in Figure 3, by log-in protocol stack network event notice, obtain forwarded information needed such as network interface, bridge port, Fdb, Arp, Fib and Conntrack automatically, specifically comprise:
Step S1: this step is the original position of forwarded rule learning, at first register network interface event notice in the linux system, when network interface establishment, deletion and state variation, network interface information is updated to the quick forwarding cache of NFP module by notification callback function.
Step S2: this step is by registration linux protocol stack bridge joint subsystem jackshaft port events notice, obtains the information of bridge port in the system, is used for NFP module bridge joint and transmits fast.
Step S3: this step is that registration hook function is in linux protocol stack bridge joint subsystem, for the required forwarding information of the quick forwarding of study NFP module bridge joint.
Step S4: this step is registration linux protocol stack neighbours subsystem rule notice chain, by the corresponding relation of notification event call back function study IP address and MAC Address, is used for NFP module I P address and resolves.
Step S5: this step is route-caching change events notice in the registration linux protocol stack routing subsystem, by the notification event call back function NFP module is arrived in the Fib information updating, and set up incidence relation with the Arp rule, be used for obtaining next-hop ip address when the NFP module is transmitted fast and sending network interface.
Step S6: this step is that registration linux protocol stack connects Track Table change events notice, 5 tuples that will connect by the notification event call back function are updated to the NFP module, and with Fib and Arp rule association, IP address and Port conversion when being used for the NFP module and transmitting fast.
In the present embodiment, transmit the detailed process of data flow in the NFP module fast as shown in Figure 3, comprise the steps:
Step M1: this step is that the NFP module is transmitted entrance fast, directly enters this step process after network interface card receives network package.
Step M2: this step mainly is according to the network interface Id that receives network package, requester network virtual interface from the quick forwarding cache of NFP, and if there is no the corresponding virtual network interface returns the processing of linux protocol stack, otherwise enters next step processing.
Step M3: this step mainly is that two-layer protocol in the network package and address are resolved, i.e. vlan id and mac address are returned the linux protocol stack to unknown protocol type, multicast and broadcasting packages and handled, other enter next step processing.
Step M4: this step mainly is to judge whether the virtual interface that receives network package is the bridge joint port, transmits handling process fast if enter bridge, transmits processing fast otherwise enter next step route.
Step M5: this step is to resolve the 3rd layer, the 4th layer of network package, i.e. pppoe head, ip(v4/v6) head, tcp and udp head, and check ttl, checksun and four layer protocol types, unusual package returns the linux protocol stack and handles.
Step M6: this step is that five-tuple (source IP, source port, purpose IP, destination interface and protocol type) the information coupling from quick forwarding rule cache table according to message is connected tracking, does not exist and just returns the processing of linux protocol stack.
Step M7: this step is according to transmitting rule and outgoing interface MTU value fast the network package length that is about to be forwarded to be done inspection, and the package effective length surpasses interface mtu if desired, just returns the linux protocol stack and handles (needing burst to send).
Step M8: this step is the quick forwarding rule that retrieves according to step M6, and address transition is done in third and fourth layer of package packet header, and again calculation check and.
Step M9: this step is that whether needs increase, remove package and replacement pppoe protocol header the quick forwarding of basis rule.
Step M10: this step is that whether needs increase, remove package and replacement vlan protocol header the quick forwarding of basis rule.
Step M11: this step is according to quick forwarding cache Policy Updates package two-layer protocol address and ttl value, and enters the M16 step process.
Step M12: this step is that bridge joint is transmitted entrance fast, and two-layer protocol address and reception package network interface are retrieved the quick forwarding cache rule of bridge joint at first more, does not deposit just to return to enter the processing of linux protocol stack.
Step M13: this step is that the outgoing interface type according to the quick forwarding cache rule of bridge joint of previous step retrieval judges whether to be the bridge joint mouth, is to enter step M5 to continue routing forwarding and handle, and handles otherwise enter step M14.
Step M14: this step is identical with the step M7 of routing forwarding, i.e. mtu checking.
Step M15: this step is identical with the step M10 of routing forwarding, and namely the vlan protocol header is upgraded.
Step M16: this step is last step that the NFP module is transmitted fast, sends amended network package from forwarding cache rule outgoing interface.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the quick forwarding module of network is characterized in that this module runs on kernel state, comprises with lower unit:
Registering unit: when initialization, register to each network subsystem of linux;
The rule buffer unit: be used for receiving the data forwarding information needed that the linux network protocol stack issues according to institute's logon mode when transmitting various types of network data flow first, the row cache of going forward side by side generates and transmits regular cache table fast;
Matching treatment unit: be used for before data flow in same type receives the back from network interface card again, enters the linux network protocol stack, coupling is transmitted regular cache table fast, if wherein there is the quick forwarding rule of the type data flow correspondence, then accordingly this data flow is directly sent from corresponding network interface card, otherwise this data flow is back to the linux network protocol stack, is transmitted by the linux network protocol stack and handle.
2. the quick forwarding module of network according to claim 1 is characterized in that, also comprises:
State refresh unit: in order to refresh each quick state of transmitting rule of regular buffer unit buffer memory; When having data flow to pass through the matching treatment unit directly to transmit, the quick forwarding rule that refreshes its correspondence is active state, is inactive state otherwise refresh it; Regularly remove the quick forwarding rule that is in inactive state.
3. a network is transmitted implementation method fast, and application rights requires the quick forwarding module of 1 or 2 described networks, it is characterized in that the method comprising the steps of:
The quick forwarding module of described network carries out initialization, registers to each network subsystem of linux;
When various types of network data flows were transmitted by the linux network protocol stack for the first time, the forwarded rule that the quick forwarding module of network obtains and buffer memory linux network protocol stack issues by described logon mode generated and transmits regular cache table fast;
Before receiving the back again from network interface card at the network data flow that same type is arranged, entering the linux network protocol stack, the quick forwarding module of network mates this network data flow and the list item of transmitting regular cache table fast, if there is corresponding quick forwarding rule, then accordingly this network data flow is directly sent from corresponding network interface card, otherwise this network data flow is back to the linux network protocol stack, is transmitted by it and handle.
4. transmit implementation method fast as network as described in the claim 3, it is characterized in that this method also comprises:
If the quick forwarding module of network directly sends the current network data flow according to transmitting rule fast, then refresh quick forwarding rule corresponding in the quick forwarding rule cache table for active state, be inactive state otherwise refresh;
Have network data flow pass through the NFP module directly transmit the back, in the linux network protocol stack corresponding forwarded rule overtime aging before, the state of quick forwarding rule corresponding in the regular cache table is transmitted in inquiry fast, if active state then refreshes relevant timer time in the linux protocol stack, wait overtime this operation of repetition next time;
For the quick forwarding rule that is in inactive state in the quick forwarding rule cache table, treat that the relevant timer of linux protocol stack removes when overtime next time.
5. transmit implementation method fast as network as described in the claim 3, it is characterized in that, the quick forwarding module of described network obtains and buffer memory forwarded process of rule is:
Network interface event notice in the registration linux system when network interface establishment, deletion and state variation, is updated to quick forwarding rule cache table by notification callback function with network interface information;
By registration linux protocol stack bridge joint subsystem jackshaft port events notice, obtain the information of bridge port in the system, the bridge joint that is used for the quick forwarding module of network is transmitted fast;
Registration hook function is used for the quick forwarding module bridge joint of learning network and transmits required forwarding information fast in linux protocol stack bridge joint subsystem;
Registration linux protocol stack neighbours subsystem rule notice chain by the corresponding relation of notification event call back function study IP address and MAC Address, is used for the quick forwarding module of network and carries out the IP address resolution;
Route-caching change events notice in the registration linux protocol stack routing subsystem, by the notification event call back function the quick forwarding module of network is arrived in the Fib information updating, and set up incidence relation with the Arp rule, be used for obtaining next-hop ip address when the quick forwarding module of network is transmitted fast and sending network interface;
Registration linux protocol stack connects Track Table change events notice, and 5 tuples that will connect by the notification event call back function are updated to the quick forwarding module of network, and with Fib and Arp rule association, IP address and Port change when being used for the NFP module and transmitting fast.
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| CN103647716A (en) * | 2013-11-22 | 2014-03-19 | 上海斐讯数据通信技术有限公司 | A data packet rapid forwarding method and an apparatus |
| CN104166917A (en) * | 2014-07-31 | 2014-11-26 | 宇龙计算机通信科技(深圳)有限公司 | NFC transaction event informing method and system |
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| CN104954262A (en) * | 2015-06-24 | 2015-09-30 | 上海斐讯数据通信技术有限公司 | Fast data forwarding method and system |
| CN105681194A (en) * | 2016-03-14 | 2016-06-15 | 上海市共进通信技术有限公司 | Method for realizing fast forwarding of two-layer data packet of gateway equipment |
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| CN110572330A (en) * | 2019-09-17 | 2019-12-13 | 普联技术有限公司 | method, device and medium for realizing compatibility of forwarding acceleration function and protocol stack function |
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| CN107682267A (en) * | 2017-09-21 | 2018-02-09 | 烽火通信科技股份有限公司 | The network data retransmission method and system of Linux equipment |
| CN108924050A (en) * | 2018-06-29 | 2018-11-30 | 优刻得科技股份有限公司 | Data forwarding method and its device, storage medium and network card equipment |
| CN109088957A (en) * | 2018-08-30 | 2018-12-25 | 京信通信系统（中国）有限公司 | The method, apparatus and equipment of NAT regulation management |
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| CN110224932A (en) * | 2019-05-06 | 2019-09-10 | 烽火通信科技股份有限公司 | A kind of method and system of data fast-forwarding |
| CN110572330A (en) * | 2019-09-17 | 2019-12-13 | 普联技术有限公司 | method, device and medium for realizing compatibility of forwarding acceleration function and protocol stack function |
| CN111193722A (en) * | 2019-12-16 | 2020-05-22 | 武汉思为同飞网络技术股份有限公司 | Linux kernel based accelerated forwarding method, device, equipment and medium |
| CN111193722B (en) * | 2019-12-16 | 2022-02-22 | 武汉思为同飞网络技术股份有限公司 | Linux kernel based accelerated forwarding method, device, equipment and medium |
| CN111756628A (en) * | 2020-05-14 | 2020-10-09 | 深圳震有科技股份有限公司 | Data packet forwarding processing method and system, intelligent network card and CPU |
| CN113691554A (en) * | 2021-09-01 | 2021-11-23 | 深圳市大洲智创科技有限公司 | Method for improving data forwarding performance of network equipment |
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Application publication date: 20131009 |